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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d1cc277bfea64f0f49a5ceee275a38c6c47779ed6e27184da1f27424f85ebd' 
  AND token = '9ynYUQ4095hJ9RhAxeN+0oRcnhT0NCEMhccEEVNeXJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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