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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2220e30c3e16f48428e622f186e76a9f085ba0eac029e53758ae93be7ade0b4' 
  AND token = 'Baitu9uJCddKUq6zxO1dh7MUS3Swfm6vDzp/w1uuC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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