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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f033b364d2799a2e9c32a3c9b7e9561ce4d4a5b66966c53cb6571d48ab09db67' 
  AND token = 'nI31LBN1lp0QWduGq4KKruwC7x677n62OGFXLPt96O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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