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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2bf526f34486f5f782f0cbe62ce5393b223cfdd9ee321f78cea791d05eb77f' 
  AND token = 'ObebQt0Zk6XdI7sk04sxOkgRERZUSmmsddI/vsXc/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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