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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252e2ee414584452bfa197c14e321b6ab94a1e12d3200a1f446268159087022c' 
  AND token = 'H5kiO0YonCceW2eyqVpeagJUgmmVoZa/83hvDpCIgB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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