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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd939aabbb50c628a608194a853e48ba1cbb9dbfa4ddb9dd6340184c982c8cfad' 
  AND token = 'Gqkf9lrAZ6wJxtaUgycksDAUPBG7r8fjD1s9m4Bxoco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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