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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894828de14fedf6f43a6e976f345c138b483c7346eaa1388c650fdaf0e9b1dcf' 
  AND token = '4M7N/c10jb/hKBMiysX8vMUwtQfhMzRJz0nJtfRnMuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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