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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bab1635059e59484eb44551f01ea4bf93ccfbb420e0c5d4b39463ff07dd0ef' 
  AND token = 'rGEqTN9rGG7Kle92saAP1eEIhdQ5UeyW2o2q7S7+CSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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