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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78019fdc724af85a03276764ffd17b1e6186339df4d33661ec6277f788ba2828' 
  AND token = 'LbeGbrqDYaXSH4H7VxYkUARmfJ/Dh0DhOz8E1CL/SjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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