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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1ef1aa332f5aab8ab52c542d9b5c0aa4950193a4cec11db17b1093a9fe5a54' 
  AND token = '8koJ7q/IlCoakLiSLzDZOVV/z3gsqq9v8sXnWnSzYhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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