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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82792a03ae4389a99f74f0033b14814b53b7230593441f1ff6f5269339b8cf1' 
  AND token = 'ictE4bjP8/J2DHqoZfRqdy9PMHz28Tq2sZg7aKQOQPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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