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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3040bc8792ec38fc4927ac1115bc24d9bbaa5baf5fbfba05d125b9dc5e2b1e84' 
  AND token = 'LZ2dTvBy1cPMMGmS7dmhk6xy1Z8CoXTRM1sGBNm9V6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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