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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b772032894e89e9ee9840246ee10a1ed7f0e6b8943c9b15dca204a73ff37acdb' 
  AND token = 'lGPF6y47cWIhNs/JQrZmRVQE1OFGteK6BxXDN5t7dGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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