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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592dd2e59be97db4d74e1c305e8163fd8928befc6bfbd05b4965518ad8d4a97e' 
  AND token = 'Zj5KCgFiRuZPp2ptI0BOLU6aHCyuwwK7j/k6059ONIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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