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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c156df52be11ac01af5bff4e7d301b2443f93221876f13a8d2ad83204324b932' 
  AND token = 'cSP2WD+LwNinF9JLy2sc8eKYd9ilZNfMp0pPMBupB/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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