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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aaeccd54f2e188348d2338889e33859b761ed2f39c729dde2fe82eb00969b2d' 
  AND token = '+SjXz/MZwGvrsrMR3+RVSTxLshZI6VsxeY38IMhe/Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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