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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a67585347b728c6849091d1727f88976bf1e3570121e248eb6e7efc4a0085ff' 
  AND token = 'hsNOE4M9fez6CfVG6SFwL7MTPEsszifxHkpx8fI2IRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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