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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3713c547b0de230f0de188efa2013c87792c1a6a396e66c2779f0a107fddef1' 
  AND token = 'sws2bGo+hAw/2dDp6ftsSAA5wjtSuaBoXexoPeec4pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}