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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008663577f3540d3cc416cc8e01f032790317170d8c9be898d66410572207fc4' 
  AND token = 'udsPqqjzve4+h3VHwWv9lsa8I9Dnh3iotcrigbkkQ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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