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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda7590d01c3944e63b0b3af4826040786f7b01b79a6b6f61000615b84a07c94' 
  AND token = 'CvptvFg/m8M1dzRckYQnqEUYY2oi3ugGcpjcKp/eMvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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