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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d8c2b6c6d6ea8f8e2d96fb58c19eaa56a5aa575cbf7622aac458c2d7b4ba6e' 
  AND token = 'kEG/xshSER2pQ//FtBIEfEicDY+Xg4aJ4KVem04l2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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