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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e224dbe8188e81b41b3ecd77f94cc6e1c34ddbc7954da820ad739d3de826a6e8' 
  AND token = 'Pp1RVi6DsOdU7Ir7os0n+Pba2NPoKh9W988007w1N7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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