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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fdba219fb556ed4b9da68564279bbe0eb9e87eb8a466e984bd0a3ef68d9a67' 
  AND token = 'I7fz+O9UnuEgMneVJy9hUutt+vNHFGfqc0aUm2k8DDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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