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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b66a4a103b429725bbb7de46d20f92d9eaa2b972c683e8f62ccd6a9e79e0a4' 
  AND token = 'uSxHWWZx8idKBi0dpTXVyOh7L+v3blhPMspZvww6+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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