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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f379b6fa8ffa2100a97929ede739fd79b956d86c00351cb0424aca017769aea8' 
  AND token = 'gZZuMpIuQhaTx9sLzUa8+Bx4RQqWrtaHZqFQNwqfOXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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