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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab10e9aa3dd2417007f856adfb195509f13ff0878106217209562c52d890a334' 
  AND token = '0wQ57a36nUoQZ6RB/2Hch8rCvy9xTK8EtD2emhy2TKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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