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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80aebe734e0374a91116263042c1b6aeb02a1ddcc80c1298f59958ee5def9883' 
  AND token = '7qT7ShMpwUEYNKD1mXphpmG4rIidJ3Uvitngi7hZigg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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