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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065a8d8f0ef5728ecd9e20a5d00831695d244c4af6d65f41ca6135b931e839e9' 
  AND token = 'bfR4H26656ka6GeQMGiMOMQ37jw81vsWLo9W2o+EpkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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