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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cba823af9a17f545a8be284c4f01422243faa515fcf3be5f4b9511b404aefe1' 
  AND token = 'KmQgyxSkMAxoxczc4hE38CvkPBCvRA6OEXry9rs8Gds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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