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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9c006f72e85ebfb1b0065c6af92adcdee217a7f57d51db5ffad38a0a802861' 
  AND token = '0AnWRbO5avkPt3fjfZPD/hw5Kxq95stL/ySysZ/oE1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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