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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3838e88a584b57f9a06988ccab0b1934b4cfd4c181cf0fe5a56080a5b35b119e' 
  AND token = 'gO8Oc6BTmhtDgLhQkyE1stgL/wz7JJ0HiHvq/EuruC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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