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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a3f75967859b2965a7bc51f8ca96d5fea9318f035112eb32dd23a7f7153036' 
  AND token = 'RCfF0Fst8AI+7S6JiFneC3in6s80BaF2x/LpKyJsGn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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