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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90258bca99f36ddbb7be5a0566008e5218282b02b67125cc1fc28a0439b30c6' 
  AND token = 'MqBY0eJS7Erq6zM3J64Zlylvygf37E0cGICKtb09j7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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