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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7d49991c145a66b221deb9deb32e5dba2b1edda059e463c6f5b2a4927759d6' 
  AND token = 'jkT/CPQ91raIhId4EJJw204zT63q7rWxJhdEo1/KYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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