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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3742501dd8c96db97026ed1da1e9444fb6b4147ed59bd490e687081c2d7392e' 
  AND token = 'ZxaCuNO4d9B3ODq4QRo23tg4VWTF1MTv+CRB4pASPtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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