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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7f6cfbb02a260e1d1c5f818b9a9b3ce753910d1bcc5e59b04327adbf210a87' 
  AND token = 'HeB2Q6ck6mIp24E2JoLnJRs2ZhtSEeSk7rypLpcI3/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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