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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63eaa12f8420c6813b1ff52bb843b1d73f8fafb78a61743aea521148f8cb3c92' 
  AND token = 'mvYNWI0N4zaehV+jnwdxOfXdKthmAE3F4DRNzhtHuCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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