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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191c21904787a0f4f9253f5eeb7f7e0e0f55ecb8ba26bcb95933f4867325ecdb' 
  AND token = '4WPDA8I+EvCfx5pwA9foN9A0da7OUP+g2iuZUD//mHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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