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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056663923d93321f9a419d5386dd0881e5d223c08b25f92e1b3b2af858955f6b' 
  AND token = 'UsRoWy0/hsfElB+vReSwLt3juNigYe27yJ32MggT6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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