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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5693c15578e6c7ca025d26493a5fa985c1d757004308e35c056bcc7301c1249' 
  AND token = 's2EKXPSVYHWuzNewFY0RmEOItx3vsu/70zaw8nvGDBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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