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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb0e39098fd95fe29fcd30a418f891dd9a1226aae6e74f861c62de7e4d57834' 
  AND token = 'JEBI0SG251N3R7IVfJ5u2RNRWxsyl9fZqn7xtfe8c/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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