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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294cca149bfb8b4901646a15eb10c16a5e8db2ced4dd7b8d0ae174092e89b0ae' 
  AND token = 'Fy/GXH7Mjlj5v1BSuaGA6928FV6aByRI987vqRb3fb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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