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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30369b78fd4fc45ad533fadefcf4960bf7a35fbc070fe7ce1fd94177c021ebb1' 
  AND token = 'ytlBJTMIhT6s6gptXV8lDHLCHDOpeG10kQ/r3u6Vw+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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