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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ca5d19ddcd2174e97cd2f30de6b731bd3fbfd9b6a0a940b8fb420d0699ec4b' 
  AND token = 'hA0uFCf2o9IKoLU9CAw396gWMEtxOoGPmXZyMn9znfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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