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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc395049a89b1aac3067b07280501e55626d52c455163e4e6841f1ec87934fd' 
  AND token = 'I4Sol/0a/ai770jj4OV78QnN6s6XbakR8okFC1z7BOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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