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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6d977712f690104e79c37dd108c2b47b58297f811f6b105a69905305cfaf39' 
  AND token = 'P+jqk7pYUN6227kI9vb49i+iTco1uw84uTF6kbQKcfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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