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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e17a828713bed9d5e2126a84d349933524cc7384178c6efca0f0316aad05b1' 
  AND token = 'Xl99ulColzydoyOJQc2gJ6LRxZo84Zeu5tyf1Eh6jPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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