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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cd90ec7f0aebaf319e930977e5d3d363b5c517e3027fdf0af9101c8a6ea369' 
  AND token = '0bHKDKaU2b0riCzXjdLGT/PAIwNl9xDmLjCzKRKFOj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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