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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4eebf8a4c03e6b0f891d8577364bea99953b3e0e3f5c3736116946a97ce2cb' 
  AND token = 'i5gE/JoT5G7d8TDz+dPYW6SXHBZRnqnI5gtPixQxiIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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