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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3155974ead8ec652e087db592adb85c3744fc4e1d4eaa5803d4419e66bd5ed03' 
  AND token = 'C1vlYHWW32Aw4HwMrXVELSb4ncKRgg+o0v8mQFC+/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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