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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf81cf60439f43e5a117e8c2e922e081c1d863f20b4861c64b8514116b4c50d7' 
  AND token = 'VbMjcX2yZnCvgXkzZZcLny8etnxnY65SJ7MgfO2nGQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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