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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277eeb438188c23c73a729255b50efa14b75ab3eee4f5d2f4e1e68ef965f5104' 
  AND token = 'jOADTmpVCWzgg3ZxnmXwbM2Un9dqfAG71ZN/CEuiz2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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