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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a130bbcf56cade748bf3e2f0929da43b95b03f2076d4f4026e21319a30e6dc' 
  AND token = 'gwSWUUfq13wruwXJUCYSskYTSu5iAuUH5Rzka9F3CxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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