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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd0cfe09a508c7102027091921848be645683a5a9482d2e8aa5f8961a3e210f' 
  AND token = '5BQ5GLf22HzbwJiczmc1bMBEAFrKNenFWFrkC5vjegc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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