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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5834591acf4a871b40563f6a54c76bd9e719f5e5d80cbb099fc5537ad73ea306' 
  AND token = 'U1OsulYjfAl0AJp0sznrCEf8+zGAA2TgWfxbH6PseO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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