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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9082e7937e9db6dc2f412526466931ed1d363819d666bcb711ed38771d26822' 
  AND token = 'Y11nVOELdZfY59BfUSQwd292wBWi6Kt/4IgKalwnbnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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