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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccfc328c983b446286e45726f2e3fc148e4743ddebc5cadd514afc9bec852da' 
  AND token = '/LNEi/59nKhZOzop8v3WmdJqews89eMnZK31xfjV4a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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